TY - JOUR A1 - Prager, Jens A1 - Kitze, Jessica A1 - Acheroy, Cécile A1 - Brackrock, Daniel A1 - Brekow, Gerhard A1 - Kreutzbruck, Marc T1 - SAFT and TOFD - A comparative study of two defect sizing techniques on a reactor pressure vessel mock-up JF - Journal of nondestructive evaluation N2 - Defect sizing is required for a quantitative assessment of the quality and reliability of safety relevant components and materials using ultrasonic non-destructive testing. The SAFT (Synthetic Aperture Focussing Technique) and the TOFD technique (Time Of Flight Diffraction) are such promising sizing candidates, extracting more information from the raw ultrasound echo data and the corresponding crack tip response. In this work the phased array technique is used to inspect a clad mock-up model of a pressure vessel section. The full scale model contains artificial test reflectors which are located in the weld and in the cladding region as well. The defects—representing typical flaws at a very early stage—are analysed with different frequencies, beam angles and directions of incidence. For the reconstruction of reflector indications a SAFT algorithm is applied to the phased array measurement results. Additionally the reflectors are analysed by means of the TOFD technique, using different beam angles at the same time. Both analysis methods are performed using different directions of incidence considering the complex cladding structure underneath the inner surface of the mock-up model. A direct comparison of the SAFT and TOFD techniques shows that, besides the clarity of the results, the detection and sizing capabilities of SAFT are far better. KW - Ultrasonic inspection KW - Phased array probe KW - Synthetic aperture focussing technique KW - Time of flight diffraction method PY - 2013 DO - https://doi.org/10.1007/s10921-012-0153-9 SN - 0195-9298 SN - 1573-4862 VL - 32 IS - 1 SP - 1 EP - 13 PB - Plenum Press CY - New York, NY AN - OPUS4-29277 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -